Light Emitting Element Alignment Between Electrodes Using AC Waveforms
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Solution Overview
Problem
Current methods for aligning light emitting elements in display devices lack accuracy, which affects the performance and efficiency of these devices, particularly in high-temperature environments and in achieving precise alignment of inorganic light emitting diodes.
Innovation Solution
A method involving the application of asymmetric and symmetric AC voltages to form magnetic fields, deflecting and aligning light emitting elements such that conductive semiconductors are accurately positioned between electrodes, enhancing alignment accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional alignment methods are used for light emitting elements, then the manufacturing process is simple, but the alignment accuracy is insufficient
Solution Approach 1:
The patent replaces mechanical alignment methods with an electric field-based alignment system. By applying AC voltage to electrode patterns, the invention creates electric fields that automatically align light emitting elements through dielectric forces, eliminating the need for complex mechanical positioning mechanisms and achieving high alignment accuracy.
Solution Approach 2:
The invention utilizes changes in electric field parameters (voltage frequency, amplitude, and waveform) to control the alignment process. By adjusting these parameters, the system can achieve different alignment states and optimize for specific element types, providing a flexible and accurate alignment solution without mechanical complexity.
2Reliability
If organic material is used as fluorescent material, then the manufacturing process is simple, but the durability in high-temperature environments is reduced
Solution Approach 1:
The patent changes the material parameter from organic to inorganic fluorescent materials, fundamentally improving high-temperature durability. This material substitution enables the display device to operate reliably in high-temperature environments while the electric field alignment system maintains manufacturing simplicity through automated alignment processes.
3Use of energy by moving object
If inorganic light emitting diodes are used, then the efficiency of blue light is improved, but the alignment precision requirements are increased
Solution Approach 1:
The patent employs electric field-based alignment to meet the heightened precision requirements of inorganic LED manufacturing. The electric fields provide sub-micron alignment precision through controllable dielectric forces, enabling accurate positioning of inorganic light emitting elements without requiring complex mechanical precision systems.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach significantly improves the accuracy of light emitting element alignment, leading to improved display device performance and durability, especially in high-temperature conditions.
Implementation Method 1
an asymmetric magnetic field can be formed by applying a first AC voltage having an asymmetric waveform to a second electrode, and thus light emitting elements may be deflected toward a first electrode
Implementation Method 2
a symmetric magnetic field can be formed by applying a second AC voltage having a symmetric waveform to the second electrode, and thus the light emitting elements deflected to the first electrode can be aligned toward the center between the first electrode and the second electrode
Data Source
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AI summary
A method of aligning light emitting elements and a method of manufacturing a display device using the method of aligning light emitting elements are provided. The method of aligning light emitting elements, comprises: applying a ground voltage to a first electrode and applying a first AC voltage to a second electrode spaced apart from the first electrode; and applying a ground voltage to the first electrode and applying a second AC voltage to the second electrode, wherein the first AC voltage has an asymmetric waveform.